I know how you feel and that is why I will not have kids. But if you had a hard time yourself you will be able to relate with your son even more and guide him. Be there for him. You were able to find a partner and have children, I’m sure you and your son will have many great memories. And when your son stutters look at it more from the perspective of how a stutter only means it takes longer for him to speak and thats it.